[jrochkind1]

Is there any point to giving the option for OSX? When was the last OSX version that did not support 64bit? Is there any reason to prefer a 32bit version on an OSX that supports 64bit?

Real questions, not rhetorical!

If I look at http://www.chromium.org/getting-involved/dev-channel , they list a Windows 32-bit channel and separate 64-bit channel, but only one Mac channel. I'm not sure if this means anything about their release intentions, or if the page may still be updated.

[comex]

OS X has supported x86_64 applications since 10.5 (Leopard), so there's no problem there if your CPU supports it; moreover, the last OS X release to support 32-bit-only x86 CPUs was 10.6 (Snow Leopard). However, Chrome does support 10.6, so I guess this release may have the effect of dropping support for some Mac models from 2006 that previously worked.